# serial_number = input("朱晏莹是猪吗？")
# if serial_number == '是':
#     print("好的，知道了")
# else:
#     print("还不承认")
ret  = int("4")
print(ret)
eval("5.6")
# para1 = input("请输入被减数")
# para2 = input("请输入减数")
# print(type(para1))
print(float(5))

# num = eval(input("Please input whatever number you want: "))
#
# num_double = num * 2
#
# print(num)
#
# print(num_double)

try:
  ret = eval("5.6") * eval("5.95p")
except:
    print("请输入正确格式的数字：")
    para1 = input("")
print(ret)
print(para1)